git.sur5r.net Git - openldap/blob - servers/slapd/ctxcsn.c

   1 /* ctxcsn.c -- Context CSN Management Routines */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2003-2008 The OpenLDAP Foundation.
   6  * Portions Copyright 2003 IBM Corporation.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted only as authorized by the OpenLDAP
  11  * Public License.
  12  *
  13  * A copy of this license is available in the file LICENSE in the
  14  * top-level directory of the distribution or, alternatively, at
  15  * <http://www.OpenLDAP.org/license.html>.
  16  */
  17
  18 #include "portable.h"
  19
  20 #include <stdio.h>
  21
  22 #include <ac/string.h>
  23 #include <ac/socket.h>
  24
  25 #include "lutil.h"
  26 #include "slap.h"
  27 #include "lutil_ldap.h"
  28
  29 const struct berval slap_ldapsync_bv = BER_BVC("ldapsync");
  30 const struct berval slap_ldapsync_cn_bv = BER_BVC("cn=ldapsync");
  31 int slap_serverID;
  32
  33 void
  34 slap_get_commit_csn(
  35         Operation *op,
  36         struct berval *maxcsn
  37 )
  38 {
  39         struct slap_csn_entry *csne, *committed_csne = NULL;
  40         BackendDB *be = op->o_bd->bd_self;
  41
  42         if ( maxcsn ) {
  43                 BER_BVZERO( maxcsn );
  44         }
  45
  46         ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
  47
  48         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
  49                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
  50                         csne->ce_state = SLAP_CSN_COMMIT;
  51                         break;
  52                 }
  53         }
  54
  55         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
  56                 if ( csne->ce_state == SLAP_CSN_COMMIT ) committed_csne = csne;
  57                 if ( csne->ce_state == SLAP_CSN_PENDING ) break;
  58         }
  59
  60         if ( committed_csne && maxcsn ) *maxcsn = committed_csne->ce_csn;
  61         ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
  62 }
  63
  64 void
  65 slap_rewind_commit_csn( Operation *op )
  66 {
  67         struct slap_csn_entry *csne;
  68         BackendDB *be = op->o_bd->bd_self;
  69
  70         ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
  71
  72         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
  73                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
  74                         csne->ce_state = SLAP_CSN_PENDING;
  75                         break;
  76                 }
  77         }
  78
  79         ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
  80 }
  81
  82 void
  83 slap_graduate_commit_csn( Operation *op )
  84 {
  85         struct slap_csn_entry *csne;
  86         BackendDB *be;
  87
  88         if ( op == NULL ) return;
  89         if ( op->o_bd == NULL ) return;
  90         be = op->o_bd->bd_self;
  91
  92         ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
  93
  94         LDAP_TAILQ_FOREACH( csne, be->be_pending_csn_list, ce_csn_link ) {
  95                 if ( csne->ce_opid == op->o_opid && csne->ce_connid == op->o_connid ) {
  96                         LDAP_TAILQ_REMOVE( be->be_pending_csn_list,
  97                                 csne, ce_csn_link );
  98                         Debug( LDAP_DEBUG_SYNC, "slap_graduate_commit_csn: removing %p %s\n",
  99                                 csne->ce_csn.bv_val, csne->ce_csn.bv_val, 0 );
 100                         if ( op->o_csn.bv_val == csne->ce_csn.bv_val ) {
 101                                 BER_BVZERO( &op->o_csn );
 102                         }
 103                         ch_free( csne->ce_csn.bv_val );
 104                         ch_free( csne );
 105                         break;
 106                 }
 107         }
 108
 109         ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
 110
 111         return;
 112 }
 113
 114 static struct berval ocbva[] = {
 115         BER_BVC("top"),
 116         BER_BVC("subentry"),
 117         BER_BVC("syncProviderSubentry"),
 118         BER_BVNULL
 119 };
 120
 121 Entry *
 122 slap_create_context_csn_entry(
 123         Backend *be,
 124         struct berval *context_csn )
 125 {
 126         Entry* e;
 127
 128         struct berval bv;
 129
 130         e = entry_alloc();
 131
 132         attr_merge( e, slap_schema.si_ad_objectClass,
 133                 ocbva, NULL );
 134         attr_merge_one( e, slap_schema.si_ad_structuralObjectClass,
 135                 &ocbva[1], NULL );
 136         attr_merge_one( e, slap_schema.si_ad_cn,
 137                 (struct berval *)&slap_ldapsync_bv, NULL );
 138
 139         if ( context_csn ) {
 140                 attr_merge_one( e, slap_schema.si_ad_contextCSN,
 141                         context_csn, NULL );
 142         }
 143
 144         BER_BVSTR( &bv, "{}" );
 145         attr_merge_one( e, slap_schema.si_ad_subtreeSpecification, &bv, NULL );
 146
 147         build_new_dn( &e->e_name, &be->be_nsuffix[0],
 148                 (struct berval *)&slap_ldapsync_cn_bv, NULL );
 149         ber_dupbv( &e->e_nname, &e->e_name );
 150
 151         return e;
 152 }
 153
 154 void
 155 slap_queue_csn(
 156         Operation *op,
 157         struct berval *csn )
 158 {
 159         struct slap_csn_entry *pending;
 160         BackendDB *be = op->o_bd->bd_self;
 161
 162         pending = (struct slap_csn_entry *) ch_calloc( 1,
 163                         sizeof( struct slap_csn_entry ));
 164
 165         Debug( LDAP_DEBUG_SYNC, "slap_queue_csn: queing %p %s\n", csn->bv_val, csn->bv_val, 0 );
 166
 167         ldap_pvt_thread_mutex_lock( &be->be_pcl_mutex );
 168
 169         ber_dupbv( &pending->ce_csn, csn );
 170         ber_bvreplace_x( &op->o_csn, &pending->ce_csn, op->o_tmpmemctx );
 171         pending->ce_connid = op->o_connid;
 172         pending->ce_opid = op->o_opid;
 173         pending->ce_state = SLAP_CSN_PENDING;
 174         LDAP_TAILQ_INSERT_TAIL( be->be_pending_csn_list,
 175                 pending, ce_csn_link );
 176         ldap_pvt_thread_mutex_unlock( &be->be_pcl_mutex );
 177 }
 178
 179 int
 180 slap_get_csn(
 181         Operation *op,
 182         struct berval *csn,
 183         int manage_ctxcsn )
 184 {
 185         if ( csn == NULL ) return LDAP_OTHER;
 186
 187         /* gmtime doesn't always need a mutex, but lutil_csnstr does */
 188         ldap_pvt_thread_mutex_lock( &gmtime_mutex );
 189         csn->bv_len = lutil_csnstr( csn->bv_val, csn->bv_len, slap_serverID, 0 );
 190         ldap_pvt_thread_mutex_unlock( &gmtime_mutex );
 191
 192         if ( manage_ctxcsn )
 193                 slap_queue_csn( op, csn );
 194
 195         return LDAP_SUCCESS;
 196 }